usbnet: introduce usbnet_link_change API
This patch introduces the API of usbnet_link_change, so that usbnet can handle link change centrally, which may help to implement killing traffic URBs for saving USB bus bandwidth and host controller power. Signed-off-by: NMing Lei <ming.lei@canonical.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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